Multiple fuse with rotary switch



Oct: 12 1926.

J. M. SCHMIERER MULTIPLE FU SE WITH ROTARY SWITCH Filed Deg. 22 9 2 Patented Oct. 12, 1926.

PATENT OFFICE} J'OHANNES MICHAEL SCHMIERER, F BERLIN, GERMANY.

MULTIPLE FUSE WITH ROTARY SWITCH.

Application filed December 22, 1922, Serial No. 608,562, and in Germany December 24, 1921.

This invention has reference to multiple safety fuses made in sections, and of which at least one section is rotatable, and it is intended to generally improve the construction and operation of devices of the kind referred to. The multiple safety fuses as heretofore known, constitute an unseparable whole or an undivided unit which becomes worthless, when all the fuse insertions have been blown. This invention is distinguished from these previous constructions by constructing the fuse of two sections substantially comprising a casing inserted into the socket, and a rotatable drum or the like 1 containing the inserted fuses. By this means the life of the device is prolonged and a great economy is produced. The casing is provided with the current admitting means, thus for instance, with a threaded 2 member and a central stud the shape and arrangement of which depend upon the construction and sizes of the socket. The casing is moreover provided with a contact finger or member connected to one of the current admitting means, and which upon the rotation of the drum is caused to make contact successively with the several terminal contacts of the safety fuses, so as to insert the same in succession into the circuit to be protected. At their other ends all the inserted fuses are connected to a common contact which engages the second current admitting member of the casing. After all of the inserted fuses have been v blown, it is only necessary, as contradistinguished from the well known previous multiplesafety fuses, to merely exchange the drum, while the casing may be permanently used, so that the costs of renewal of the device are considerably reduced. In order to facilitate the exchanging of tl1e drums the latter according to the invention are so shaped or disposed as to partlyjprqect from the casing. The said pro ecting por- 5 tion is preferably shaped to eonstltute a handle, having for instance the shape of a cook, a plain two-armed handle, a mob,

1 v 6, 21.15! tOitiMISC 0!. 10 Me, an 1 1,.) acapa (I serve both for the turning as well as for the insertion, and removal of the drums.

On the accompanying drawing T have shown the invention by way of example as embodied in a se'xtuple or six-fold fuse,

Figure 1. showing the safety fuse in side view; Figure 2 is a vertical sectional view through the same; Figure 3 is an elevation of the handle part of the device; Figure 4 is a horizontal section on the line A-B, and Figure 5 is a horizontal section on the line CD.

Figures 3 and 4 are seen from below.

In the drawings :a is the insulating body of the casing, Z) is the insulating portion of the drum, and c is the handle which may be cemented to the latter. The handle may also be made in one piece with the drum, but making them in two separate pieces facilitates the manufacture thereof. Upon the body a of the casing the threaded member d, and the stud e are secured, the thread being for instance made to fit the Edison-sockets. The stud e is secured by cementing, and the outside thereof is fabric coated, so as to retain it in position more securely. The threaded part, the stud e and the cylindrical portion intermediate therewith of the body of the casing jointly constitute the supporting member the sizes of which in the safety fuses for different strengths of current differ from each other, so as to preclude the possibility of any confounding of the same. The casing contains the contact spring the lower portion ofwhich is soldered to the threaded part. The spring is lodged in a recess of rectangular cross section (Figure .4), and it therefore can only be compressed in the radial direction. In order to produce a good guiding action, the said spring consists of a T-shaped piece of sheet metal the lateral ears or pro- JBClZiODS of which are rectangular-1y turned backwards (Figure 1). The upper edge of the body of the casing is beaded or thickened, so as to form a kind of collar, and it is provided with indicating marks (figures or numerals 1 to 6), in order to indicate the particular position of the drum at the time being. Intermediate the several numerals grooves are provided, so as to facilitate the screwing of the safety fuse mto the soc/ct l 719 cylinder! 011 my all/10 066212;, serves for the mounting of the drum. The upper portion of the body of the drum is cylindrical, while the lower part has the cross sectional shape of a hexagon with deeply recessed corners (Figure 4). The

Oct. 12 1926.

F. SEELAU VARIABLE CONDENSER Filed on. 25. 192.4

INVENTOR E'Seelau BY 2 g j ATTORNEY 

